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Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Interactions between distal speech rate, linguistic knowledge, and speech environment.

Tuuli Morrill1, Melissa Baese-Berk2, Christopher Heffner3

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Listeners flexibly weigh speech rate and linguistic knowledge for word perception. Changing the speech environment can alter how signal-based cues influence understanding, supporting flexible word segmentation models.

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Area of Science:

  • Psycholinguistics
  • Speech Perception
  • Cognitive Science

Background:

  • Lexical access involves integrating signal-based and knowledge-based cues.
  • Linguistic context influences the perception of acoustic speech information.
  • Cues in lexical access are flexibly implemented and influenced by broader speech context.

Purpose of the Study:

  • To investigate the influence of distal speech rate and linguistic structure on lexical perception.
  • To examine how signal-based cues are affected by information within the speech environment.
  • To test predictions of flexible weighting models for word segmentation.

Main Methods:

  • Two experiments were conducted manipulating distal speech rate and linguistic structure.
  • Experiment 1 used utterances with obligatory or optional critical words to test speech rate effects.
  • Experiment 2 varied linguistic structures in filler utterances to assess environmental influences.

Main Results:

  • Both speech rate and knowledge of critical word obligatoriness significantly influence speech perception.
  • The impact of signal-based cues can be modified by altering the surrounding speech environment.
  • Findings support models where signal-based and knowledge-based cues are weighted flexibly.

Conclusions:

  • Speech perception flexibly integrates acoustic information with linguistic knowledge.
  • The speech environment plays a crucial role in modulating cue integration during lexical access.
  • Flexible weighting of cues is essential for robust word segmentation.